[9] COLLECTING AND PRESERVING SCALE INSECTS COCKERELL. 



CONCLUDING REMARKS. 



The present short article is intended to emphasize the fact that a great 

 deal of useful work can be done by those who are not coccidologists, but 

 happen to reside in or visit unexamined localities. Material obtained 

 by such i)ersons, if sent to the United States National Museum or 

 Department of Agriculture, will be thankfully received, fully reported 

 upon as time i^ermits, and proper credit will be given to the collectors. 

 Assistance of this kind is not asked as a favor; it is rather supposed 

 that there are many persons who would themselves take a pride in 

 adding to the knowledge of an interesting group of insects, while at 

 the same time indirectly conferring a benefit upon horticulture. 



It is to be remarked, however, that there is a pressing need for new 

 students as well as Jiew collectors. The small band of coccidologists 

 now at work will welcome any addition to their ranks, and (I am sure 

 I may speak in this for all) will only too gladly assist any student who 

 shows a serious intention to elucidate any branch of the subject. 



LITERATURE. 



The student will find the following literature especially useful. 



V. SiGNORET. Essaisurles coclienilles. 1868-1876. (A complete monograph to date 



of publication.) 

 J. H. COMSTOCK. Report on scale insects, in Rep. U. S. Dept. Agriculture for 1880. 



Second report on scale insects, in 2d Rep. Dep. Entomology, Cornell Univ. Esp. 



Sta. 1883. (Includes all DiaspiniB to date.) 

 "W. M. Maskell. Scale insects of New Zealand, 1887. 

 E. E. Green. The Coccidse of Ceylon, (In course of publication.) 



A general summary of what is known about coccid faunae will be 

 found in Proceedings United States National Museum, Vol. XVII, pp. 

 615-625. In the same Proceedings, Vol. XIX, pp. 725-785, is a detailed 

 article on the food-plants of Coccida), the insects being arranged under 

 the names of the plants infested. A check list of all known coccidas 

 has been published in Bulletin Illinois State Laboratory of Natural 

 History, 1896. The yearly bibliography of coccid writings given in the 

 Zoological Eecord should be consulted by every student. 



Mesilla, New Mexico, August, 1897. 



